Organic acids are compounds that contain one or more carboxyl groups (-COOH) attached to a carbon atom. These acids are found in various natural sources, including plants and animals. Therefore, the correct answer is option 'D' - Plants and animals.

Let's delve into more detail to understand why organic acids can be obtained from both plants and animals.

1. Organic Acids in Plants:
Plants produce organic acids through various metabolic processes. These acids play crucial roles in plant growth, development, and defense mechanisms. Here are a few examples of organic acids found in plants:

- Citric acid: Found in citrus fruits such as lemons and oranges, as well as other fruits like pineapples and strawberries.
- Malic acid: Present in apples, cherries, and grapes.
- Oxalic acid: Found in spinach, rhubarb, and other leafy green vegetables.
- Acetic acid: Produced during fermentation, it is found in vinegar and various fermented foods.

These acids are often responsible for the characteristic flavors and tastes of fruits and vegetables.

2. Organic Acids in Animals:
Animals also produce organic acids as part of their metabolic processes. These acids are involved in various physiological functions. Here are a few examples of organic acids found in animals:

- Lactic acid: Produced in muscles during strenuous exercise, causing muscle fatigue and soreness.
- Uric acid: Formed as a waste product of purine metabolism in animals, including humans.
- Formic acid: Secreted by certain ants and other insects as a defense mechanism.

These acids are essential for maintaining proper physiological balance and performing specific functions in the body.

3. Common Organic Acids:
There are several organic acids that are found in both plants and animals. Some examples include:

- Acetic acid: Present in both vinegar and the metabolic pathways of animals.
- Citric acid: Found in citrus fruits and is also an intermediate in the Krebs cycle, a metabolic pathway occurring in animals.
- Malic acid: Present in apples and is also involved in the metabolic processes of animals.

These examples further emphasize the fact that organic acids can be obtained from both plants and animals.

In conclusion, organic acids are obtained from both plants and animals. While plants produce organic acids as part of their metabolic processes, animals also synthesize and utilize organic acids for various physiological functions. Therefore, option 'D' - Plants and animals is the correct answer.

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